willie's Custom Brass Willie's Trombone Mouthpiece MASSONG Series Alto GP Finish (5AM)

For alto by Michael Masson. For those who want to share the rim with tenor. Optimized for the Thyne Universal model alto trombone Supervisor: Michael Masson GP finish Rim diameter 25.50 (mm) Throat diameter 6.00 (mm) Approximate size of other companies Size: Back 5E